linux-kernel - Re: Udpated sys_membarrier() speedup patch, FYI

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Message-ID: <3ac1d851-d833-004c-3c3b-b4d804cbca69@scylladb.com>
Date:   Mon, 31 Jul 2017 11:53:59 +0300
From:   Avi Kivity <avi@...lladb.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        maged michael <maged.michael@...il.com>,
        Andrew Hunter <ahh@...gle.com>, gromer <gromer@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Udpated sys_membarrier() speedup patch, FYI

On 07/31/2017 11:37 AM, Peter Zijlstra wrote:
> On Mon, Jul 31, 2017 at 09:03:09AM +0300, Avi Kivity wrote:
>> I remembered that current->mm does not change when switching to a kernel
>> task, but my Kernlish is very rusty, or maybe it has changed.
> kernel threads do indeed preserve the mm of the old userspace task, but
> we track that in ->active_mm. Their ->mm will be NULL.

Gah, I'm so rusty, if I were any rustier I'd be doing bitcoin.